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Submission #395458

# Submission time Handle Problem Language Result Execution time Memory
395458 2021-04-28T11:26:52 Z Nordway Railway (BOI17_railway) C++17
100 / 100
 197 ms 25228 KB 
#include <bits/stdc++.h>


using namespace std;

const int N = 1e5 + 1;

vector <pair<int, int>> g[N];
int timer, tin[N], tout[N], up[N][18];

void dfs(int v, int p = 1) {
	tin[v] = ++timer;
	up[v][0] = p;
	for (int i = 1; i <= 17; i++) up[v][i] = up[up[v][i - 1]][i - 1];
	for (pair<int, int> to : g[v]) {
		if (to.first != p) {
			dfs(to.first, v);
		}
	}
	tout[v] = timer;
}

bool upper(int u, int v) {
	return tin[u] <= tin[v] && tout[u] >= tout[v];
}

int lca(int u, int v) {
	if (upper(u, v)) return u;
	if (upper(v, u)) return v;
	for (int i = 17; i >= 0; i--) {
		if (!upper(up[u][i], v)) {
			u = up[u][i];
		}
	}
	return up[u][0];
}

bool cmp(int u, int v) {
	return tin[u] < tin[v];
}

int cnt[N], dp[N];

void dfs2(int v, int p = 1, int edg = 0) {
	for (pair<int, int> to : g[v]) {
		if (to.first != p) {
			dfs2(to.first, v, to.second);
			dp[v] += dp[to.first];
		}
	}
	cnt[edg] = dp[v];
}

int main(){

	int n, m, k;
	cin >> n >> m >> k;
	for (int i = 1; i < n; i++) {
		int u, v;
		cin >> u >> v;
		g[u].push_back(make_pair(v, i));
		g[v].push_back(make_pair(u, i));
	}
	dfs(1);
	for (int i = 1; i <= m; i++) {
		int s;
		cin >> s;
		vector <int> S;
		for (int j = 1; j <= s; j++) {
			int a;
			cin >> a;
			S.push_back(a);
		}
		sort(S.begin(), S.end(), cmp);
		for (int j = 0; j < s; j++) {
			int u = S[j], v = S[(j + 1) % s];
			int L = lca(u, v);
			dp[u]++, dp[v]++;
			dp[L] -= 2;
		}
	}
	dfs2(1);
	vector <int> ans;
	for (int i = 1; i < n; i++) {
		if (cnt[i] >= k + k) {
			ans.push_back(i);
		}
	}
	cout << ans.size() << "\n";
	for (int edg : ans) cout << edg << " ";
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2636 KB Output is correct
2 Correct 11 ms 3916 KB Output is correct
3 Correct 11 ms 3972 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 13 ms 4428 KB Output is correct
7 Correct 11 ms 4028 KB Output is correct
8 Correct 10 ms 3992 KB Output is correct
9 Correct 11 ms 3916 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2652 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2636 KB Output is correct
2 Correct 11 ms 3916 KB Output is correct
3 Correct 11 ms 3972 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 13 ms 4428 KB Output is correct
7 Correct 11 ms 4028 KB Output is correct
8 Correct 10 ms 3992 KB Output is correct
9 Correct 11 ms 3916 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2652 KB Output is correct
15 Correct 44 ms 4308 KB Output is correct
16 Correct 43 ms 4300 KB Output is correct
17 Correct 43 ms 4444 KB Output is correct
18 Correct 12 ms 4336 KB Output is correct
19 Correct 11 ms 4044 KB Output is correct
20 Correct 53 ms 4524 KB Output is correct
21 Correct 53 ms 4392 KB Output is correct
22 Correct 2 ms 2636 KB Output is correct
23 Correct 11 ms 3988 KB Output is correct
24 Correct 12 ms 3916 KB Output is correct
25 Correct 2 ms 2636 KB Output is correct
26 Correct 2 ms 2656 KB Output is correct
27 Correct 12 ms 4460 KB Output is correct
28 Correct 11 ms 4044 KB Output is correct
29 Correct 10 ms 3952 KB Output is correct
30 Correct 10 ms 3952 KB Output is correct
31 Correct 2 ms 2636 KB Output is correct
32 Correct 2 ms 2636 KB Output is correct
33 Correct 2 ms 2660 KB Output is correct
34 Correct 2 ms 2636 KB Output is correct
35 Correct 2 ms 2636 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 141 ms 23004 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 138 ms 22648 KB Output is correct
4 Correct 136 ms 22072 KB Output is correct
5 Correct 137 ms 23108 KB Output is correct
6 Correct 150 ms 23360 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 146 ms 18680 KB Output is correct
2 Correct 171 ms 17224 KB Output is correct
3 Correct 175 ms 16748 KB Output is correct
4 Correct 176 ms 16836 KB Output is correct
5 Correct 197 ms 16820 KB Output is correct
6 Correct 149 ms 20676 KB Output is correct
7 Correct 147 ms 20580 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 146 ms 18680 KB Output is correct
2 Correct 171 ms 17224 KB Output is correct
3 Correct 175 ms 16748 KB Output is correct
4 Correct 176 ms 16836 KB Output is correct
5 Correct 197 ms 16820 KB Output is correct
6 Correct 149 ms 20676 KB Output is correct
7 Correct 147 ms 20580 KB Output is correct
8 Correct 167 ms 20752 KB Output is correct
9 Correct 159 ms 20676 KB Output is correct
10 Correct 136 ms 24988 KB Output is correct
11 Correct 138 ms 24932 KB Output is correct
12 Correct 139 ms 16428 KB Output is correct
13 Correct 133 ms 16544 KB Output is correct
14 Correct 165 ms 16576 KB Output is correct
15 Correct 165 ms 16580 KB Output is correct
16 Correct 179 ms 16752 KB Output is correct
17 Correct 182 ms 16840 KB Output is correct
18 Correct 174 ms 16836 KB Output is correct
19 Correct 173 ms 17104 KB Output is correct
20 Correct 152 ms 20880 KB Output is correct
21 Correct 154 ms 20992 KB Output is correct
22 Correct 155 ms 20932 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2636 KB Output is correct
2 Correct 11 ms 3916 KB Output is correct
3 Correct 11 ms 3972 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 13 ms 4428 KB Output is correct
7 Correct 11 ms 4028 KB Output is correct
8 Correct 10 ms 3992 KB Output is correct
9 Correct 11 ms 3916 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2652 KB Output is correct
15 Correct 44 ms 4308 KB Output is correct
16 Correct 43 ms 4300 KB Output is correct
17 Correct 43 ms 4444 KB Output is correct
18 Correct 12 ms 4336 KB Output is correct
19 Correct 11 ms 4044 KB Output is correct
20 Correct 53 ms 4524 KB Output is correct
21 Correct 53 ms 4392 KB Output is correct
22 Correct 2 ms 2636 KB Output is correct
23 Correct 11 ms 3988 KB Output is correct
24 Correct 12 ms 3916 KB Output is correct
25 Correct 2 ms 2636 KB Output is correct
26 Correct 2 ms 2656 KB Output is correct
27 Correct 12 ms 4460 KB Output is correct
28 Correct 11 ms 4044 KB Output is correct
29 Correct 10 ms 3952 KB Output is correct
30 Correct 10 ms 3952 KB Output is correct
31 Correct 2 ms 2636 KB Output is correct
32 Correct 2 ms 2636 KB Output is correct
33 Correct 2 ms 2660 KB Output is correct
34 Correct 2 ms 2636 KB Output is correct
35 Correct 2 ms 2636 KB Output is correct
36 Correct 141 ms 23004 KB Output is correct
37 Correct 2 ms 2636 KB Output is correct
38 Correct 138 ms 22648 KB Output is correct
39 Correct 136 ms 22072 KB Output is correct
40 Correct 137 ms 23108 KB Output is correct
41 Correct 150 ms 23360 KB Output is correct
42 Correct 146 ms 18680 KB Output is correct
43 Correct 171 ms 17224 KB Output is correct
44 Correct 175 ms 16748 KB Output is correct
45 Correct 176 ms 16836 KB Output is correct
46 Correct 197 ms 16820 KB Output is correct
47 Correct 149 ms 20676 KB Output is correct
48 Correct 147 ms 20580 KB Output is correct
49 Correct 167 ms 20752 KB Output is correct
50 Correct 159 ms 20676 KB Output is correct
51 Correct 136 ms 24988 KB Output is correct
52 Correct 138 ms 24932 KB Output is correct
53 Correct 139 ms 16428 KB Output is correct
54 Correct 133 ms 16544 KB Output is correct
55 Correct 165 ms 16576 KB Output is correct
56 Correct 165 ms 16580 KB Output is correct
57 Correct 179 ms 16752 KB Output is correct
58 Correct 182 ms 16840 KB Output is correct
59 Correct 174 ms 16836 KB Output is correct
60 Correct 173 ms 17104 KB Output is correct
61 Correct 152 ms 20880 KB Output is correct
62 Correct 154 ms 20992 KB Output is correct
63 Correct 155 ms 20932 KB Output is correct
64 Correct 159 ms 20780 KB Output is correct
65 Correct 177 ms 16680 KB Output is correct
66 Correct 176 ms 16580 KB Output is correct
67 Correct 168 ms 16652 KB Output is correct
68 Correct 122 ms 16460 KB Output is correct
69 Correct 118 ms 16396 KB Output is correct
70 Correct 161 ms 21140 KB Output is correct
71 Correct 161 ms 20624 KB Output is correct
72 Correct 3 ms 2660 KB Output is correct
73 Correct 11 ms 3944 KB Output is correct
74 Correct 11 ms 4012 KB Output is correct
75 Correct 2 ms 2636 KB Output is correct
76 Correct 3 ms 2636 KB Output is correct
77 Correct 13 ms 4428 KB Output is correct
78 Correct 11 ms 4072 KB Output is correct
79 Correct 10 ms 3916 KB Output is correct
80 Correct 10 ms 4044 KB Output is correct
81 Correct 2 ms 2636 KB Output is correct
82 Correct 3 ms 2592 KB Output is correct
83 Correct 2 ms 2636 KB Output is correct
84 Correct 2 ms 2636 KB Output is correct
85 Correct 2 ms 2652 KB Output is correct
86 Correct 42 ms 4344 KB Output is correct
87 Correct 43 ms 4360 KB Output is correct
88 Correct 43 ms 4364 KB Output is correct
89 Correct 12 ms 4428 KB Output is correct
90 Correct 12 ms 4020 KB Output is correct
91 Correct 53 ms 4552 KB Output is correct
92 Correct 56 ms 4388 KB Output is correct
93 Correct 2 ms 2636 KB Output is correct
94 Correct 149 ms 24828 KB Output is correct
95 Correct 138 ms 24564 KB Output is correct
96 Correct 131 ms 24032 KB Output is correct
97 Correct 135 ms 24896 KB Output is correct
98 Correct 169 ms 25228 KB Output is correct
99 Correct 187 ms 16872 KB Output is correct
100 Correct 178 ms 16756 KB Output is correct
101 Correct 171 ms 16676 KB Output is correct
102 Correct 178 ms 17064 KB Output is correct
103 Correct 151 ms 20552 KB Output is correct
104 Correct 153 ms 20928 KB Output is correct
105 Correct 146 ms 20612 KB Output is correct
106 Correct 155 ms 20804 KB Output is correct
107 Correct 152 ms 20616 KB Output is correct
108 Correct 135 ms 24900 KB Output is correct
109 Correct 139 ms 24944 KB Output is correct
110 Correct 134 ms 16592 KB Output is correct
111 Correct 133 ms 16552 KB Output is correct
112 Correct 163 ms 16692 KB Output is correct
113 Correct 160 ms 16580 KB Output is correct